The LilyPad Simple Power is a board that lets you connect a battery (or other power source) and switch it on or off, that's it! We provide you with a JST connector and a slide switch. You can solder in your own surface mount (or through-hole) resistor in line with the output, or solder the jumper closed if you don't require a resistor. Project description, more information and ordering can be found at https://www.sparkfun.com/products/10085